On what dates of April, 2001 did Wednesday fall?

Explanation:-

We shall find the day on 1^st April, 2001.
1^st April, 2001 = (2000 years + Period from 1.1.2001 to 1.4.2001)
Odd days in 1600 years = 0
Odd days in 400 years = 0
Jan. Feb. March April
(31 + 28 + 31 + 1)     = 91 days ≡ 0 odd days.
Total number of odd days = (0 + 0 + 0) = 0
On 1^st April, 2001 it was Sunday.
In April, 2001 Wednesday falls on 4^th, 11^th, 18^th and 25^th.